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LM2900DE4 Arkusz danych(PDF) 7 Page - Texas Instruments |
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LM2900DE4 Arkusz danych(HTML) 7 Page - Texas Instruments |
7 / 16 page LM2900, LM3900 QUADRUPLE NORTON OPERATIONAL AMPLIFIERS SLOS059 – JULY 1979 – REVISED SEPTEMBER 1990 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION Norton (or current-differencing) amplifiers can be used in most standard general-purpose operational amplifier applications. Performance as a dc amplifier in a single-power-supply mode is not as precise as a standard integrated-circuit operational amplifier operating from dual supplies. Operation of the amplifier can best be understood by noting that input currents are differenced at the inverting input terminal and this current then flows through the external feedback resistor to produce the output voltage. Common-mode current biasing is generally useful to allow operating with signal levels near (or even below) ground. Internal transistors clamp negative input voltages at approximately – 0.3 V but the magnitude of current flow has to be limited by the external input network. For operation at high temperature, this limit should be approximately – 100 µA. Noise immunity of a Norton amplifier is less than that of standard bipolar amplifiers. Circuit layout is more critical since coupling from the output to the noninverting input can cause oscillations. Care must also be exercised when driving either input from a low-impedance source. A limiting resistor should be placed in series with the input lead to limit the peak input current. Current up to 20 mA will not damage the device, but the current mirror on the noninverting input will saturate and cause a loss of mirror gain at higher current levels, especially at high operating temperatures. 1 M Ω 1 M Ω 1 M Ω 100 k Ω 91 k Ω 30 k Ω 1 k Ω 10 k Ω Output Input V+ – + IO ≈ 1 mA per input volt Figure 13. Voltage-Controlled Current Source Output Input 100 k Ω 1 M Ω 1 M Ω V+ 100 k Ω 1 k Ω – + IO ≈ 1 mA per input volt Figure 14. Voltage-Controlled Current Sink |
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Podobny opis - LM2900DE4 |
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